-- Units table
CREATE TABLE units (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    organization_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
    outlet_id UUID REFERENCES outlets(id) ON DELETE CASCADE,
    name VARCHAR(50) NOT NULL,
    abbreviation VARCHAR(10),
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Indexes
CREATE INDEX idx_units_organization_id ON units(organization_id);
CREATE INDEX idx_units_outlet_id ON units(outlet_id);
CREATE INDEX idx_units_is_active ON units(is_active);
CREATE INDEX idx_units_created_at ON units(created_at);